Major Thematic Program Calabi-Yau Varieties: Arithmetic, Geometry and Physics at the Fields Institute, Toronto (July - December, 2013) (with M. Gross, S. Gukov, R. Laza, J. Walcher, S.-T. Yau, N. Yui)
Conference Nouvelles directions en arithmetique et geometrie des surfaces algebriques at CIRM in Luminy (March 11-15, 2013) (with Bert van Geemen, A. Sarti, T. Shioda)
Conference on Algebraic and Complex Geometry at Leibniz Universität Hannover (September 10-14, 2012) (with A. Frühbis-Krüger, R. Kloosterman)
Seminar on Algebraic and Arithmetic Geometry at Leibniz Universität Hannover (with W. Ebeling, K. Hulek, M. Lönne)
Workshop on Algebraic Surfaces at Leibniz Universität Hannover (February 03, 2012)
NoGAGS at Leibniz Universität Hannover (November 10 & 11, 2011) (with W. Ebeling, Anne Frühbis-Krüger, K. Hulek)
Workshop on Singularities and Monodromy at Leibniz Universität Hannover (October 6-7, 2011) (with A. Frühbis-Krüger, M. Lönne)
Workshop on Arithmetic and Geometry of K3 surfaces and Calabi-Yau threefolds at the Fields Institute, Toronto (Aug 16-25, 2011) (with C. Doran, S. Kondo, R. Laza, J. Lewis, N. Yui)
Workshop on Elliptic fibrations and K3 surfaces at Humboldt-Universität Berlin (July 14-16, 2010) (with R. Kloosterman)
NoGAGS at Leibniz Universität Hannover (June 17 & 18, 2010) (with W. Ebeling, Anne Frühbis-Krüger, K. Hulek)
Workshop on Arithmetic aspects of elliptic surfaces at Hausdorff Institute for Mathematics (March 11 & 12, 2010) (with Cecilia Salgado)